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TEXTBOOK OF ZOOLOGY 



ent in connection with the left back. There was a single heart, two 

 very unequal lungs, two pulmonary arteries and veins to the larger 

 lung, while there was only one common carotid artery, that being 

 the right. Two trachea were present, the right being rather nor- 

 mally developed while the left was rudimentary. The brain was 

 normal, but joining the medulla were two separate and complete 



Fig. 358. — Conjoined twins of cat showing single head, but double trunk and 



appendages. 



spinal cords, one passing to each back region. Most of the internal 

 organs "favored'' the right side, except the lungs, of which the 

 left was much more developed. 



Dr. P, L. Fitzpatrick reports upon the anatomy of a double pig 

 also. This freak had two tracheae leading to two sets of lungs. 

 The brain consisted of a three-lobed cerebrum, two cerebellums. 



